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  • The C programming language [book]

    1

    A12.3 Macro Definition and Expansion

    A control line of the form
    #define identifier token-sequence
    causes the preprocessor to replace subsequent instances of the identifier with the given
    sequence of tokens; leading and trailing white space around the token sequence is dis-
    carded. A second #define for the same identifier is erroneous unless the second token
    sequence is identical to the first, where all white space separations are taken to be
    equivalent

    這段其中有一個小段,我看了許久才知道作者想要表達什麼,
    A second #define for the same identifier is erroneous unless the second token
    sequence is identical to the first

    #define A 123
    #define A 1234 <<<==== warning message

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  • 原文地址:https://www.cnblogs.com/youchihwang/p/9078105.html
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